Add support for custom validation rules

input.go

@@ -6,15 +6,21 @@ import (
 	"strconv"
 )
 
-func inputInt(kind reflect.Kind, value string) interface{} {
-	return int(inputSame(reflect.Int, value).(int64))
+// InputFunc is a function that converts the parameter of a validation rule to the desired type
+type InputFunc func(reflect.Kind, string) interface{}
+
+// InputInt always returns an int
+func InputInt(kind reflect.Kind, value string) interface{} {
+	return int(InputSame(reflect.Int, value).(int64))
 }
 
-func inputRegexp(kind reflect.Kind, value string) interface{} {
+// InputRegexp always returns a compiled regular expression
+func InputRegexp(kind reflect.Kind, value string) interface{} {
 	return regexp.MustCompile(value)
 }
 
-func inputSame(kind reflect.Kind, value string) interface{} {
+// InputSame returns the type matching the field
+func InputSame(kind reflect.Kind, value string) interface{} {
 	var val interface{}
 	var err error